Perna, L., and M. Pezzopane, foF2 vs solar indices for the Rome station: Looking for the best general relation which is able to describe the anomalous minimum between cycles 23 and 24. J. of Atmos. Solar-Terr. Phys., 148, 13-21, doi: 10.1016/j.jastp.2016.08.003, 2016.